Defines tab index for the grid.

<div class="definition">
    Number, default = null
</div>

If defined, will add tabindex attribute to the grid, so that it can receive focus when user clicks tab.
<div style="height: 10px"></div>

This property can be set during object creation:
<textarea class="javascript">
let grid = new w2grid({
    name: 'grid',
    tabIndex: 100,
    columns: [
        { field: 'recid', text: 'ID', size: '50px' },
        { field: 'lname', text: 'Last Name', size: '30%' },
        { field: 'fname', text: 'First Name', size: '30%' },
        { field: 'email', text: 'Email', size: '40%' },
        { field: 'sdate', text: 'Start Date', size: '120px' },
        { field: 'sdate', text: 'End Date', size: '120px' }
    ]
});
</textarea>